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Ever-present chief White House photographer Pete Souza has also released a series of his favourite pictures from inside the White House to mark the end of the Presidency.

'THE CHARACTER OF OUR COUNTRY'

Former speechwriter Jon Favreau who served from 2005 to 2013 said one of his most memorable moments was rushing back from a friend's wedding to edit Obama's speech on health care to a joint session of Congress in 2009.

He had begun the speech based around a letter from Ted Kennedy which mentioned the "character of our country". After departing for the wedding, he returned to a page of scribbled edits and scrambled to work them into the final text.

Favreau said it reminded him building a country is "hard, unending and always worthwhile".

'WE THE PEOPLE'

President Obama listens to his introduction by Mark Barden, whose 7-year-old son Daniel was killed during the 2012 shooting at Sandy Hook. Photo / Pete Souza

"The single most powerful word in our democracy," the President said that day, "is the word 'We'. We the People. We Shall Overcome. Yes We Can. It is owned by no one. It belongs to everyone. Oh, what a glorious task we are given, to continually try to improve this great nation of ours."

The iconic image of the President and his family marching with civil rights leaders across the bridge where protesters had been met with violence years earlier became a defining image of his years in office.

Barack Obama and his family marches over the Edmund Pettus Bridge where he followed in the footsteps of activists that marched from Selma in 1965. Photo / AP

Obama's Selma speech regarded as one of his best by his speechwriters:

It's one of several moving moments on race relations throughout his leadership, including in July 2013 when he spoke about the death of Trayvon Martin.

"When Trayvon Martin was first shot I said Trayvon Martin could have been my son. Another way of saying that is that Trayvon Martin could have been me 35 years ago ..." he said.

BETWEEN TWO FERNS

Deputy chief digital officer Kori Schulman has also revealed his top 10 digital moments from the past eight years including appearing on Between Two Ferns with Zach Galifianakis, delivering a YouTube State of the Union, using a Snapchat filter for the first time and wishing Vice President Joe Biden happy birthday on Twitter.